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Diffstat (limited to 'src/main/java/org/traccar/schedule/TaskHealthCheck.java')
-rw-r--r--src/main/java/org/traccar/schedule/TaskHealthCheck.java96
1 files changed, 96 insertions, 0 deletions
diff --git a/src/main/java/org/traccar/schedule/TaskHealthCheck.java b/src/main/java/org/traccar/schedule/TaskHealthCheck.java
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+++ b/src/main/java/org/traccar/schedule/TaskHealthCheck.java
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+/*
+ * Copyright 2020 - 2022 Anton Tananaev (anton@traccar.org)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.traccar.schedule;
+
+import com.sun.jna.Library;
+import com.sun.jna.Native;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.traccar.config.Config;
+import org.traccar.config.Keys;
+
+import javax.inject.Inject;
+import javax.ws.rs.client.Client;
+import java.util.concurrent.ScheduledExecutorService;
+import java.util.concurrent.TimeUnit;
+
+public class TaskHealthCheck implements ScheduleTask {
+
+ private static final Logger LOGGER = LoggerFactory.getLogger(TaskHealthCheck.class);
+
+ private final Config config;
+ private final Client client;
+
+ private SystemD systemD;
+
+ private boolean enabled;
+ private long period;
+
+ @Inject
+ public TaskHealthCheck(Config config, Client client) {
+ this.config = config;
+ this.client = client;
+ if (!config.getBoolean(Keys.WEB_DISABLE_HEALTH_CHECK)
+ && System.getProperty("os.name").toLowerCase().startsWith("linux")) {
+ try {
+ systemD = Native.load("systemd", SystemD.class);
+ String watchdogTimer = System.getenv("WATCHDOG_USEC");
+ if (watchdogTimer != null && !watchdogTimer.isEmpty()) {
+ period = Long.parseLong(watchdogTimer) / 1000 * 4 / 5;
+ }
+ if (period > 0) {
+ LOGGER.info("Health check enabled with period {}", period);
+ enabled = true;
+ }
+ } catch (UnsatisfiedLinkError e) {
+ LOGGER.warn("No systemd support", e);
+ }
+ }
+ }
+
+ private String getUrl() {
+ String address = config.getString(Keys.WEB_ADDRESS, "localhost");
+ int port = config.getInteger(Keys.WEB_PORT);
+ return "http://" + address + ":" + port + "/api/server";
+ }
+
+ @Override
+ public void schedule(ScheduledExecutorService executor) {
+ if (enabled) {
+ executor.scheduleAtFixedRate(this, period, period, TimeUnit.MILLISECONDS);
+ }
+ }
+
+ @Override
+ public void run() {
+ LOGGER.debug("Health check running");
+ int status = client.target(getUrl()).request().get().getStatus();
+ if (status == 200) {
+ int result = systemD.sd_notify(0, "WATCHDOG=1");
+ if (result < 0) {
+ LOGGER.warn("Health check notify error {}", result);
+ }
+ } else {
+ LOGGER.warn("Health check failed with status {}", status);
+ }
+ }
+
+ interface SystemD extends Library {
+ @SuppressWarnings("checkstyle:MethodName")
+ int sd_notify(@SuppressWarnings("checkstyle:ParameterName") int unset_environment, String state);
+ }
+
+}